Normalizes the midi signature by removing the velocity from NOTE_ON and NOTE_OFF messages. - Java javax.sound.midi

Java examples for javax.sound.midi:MidiMessage

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Description

Normalizes the midi signature by removing the velocity from NOTE_ON and NOTE_OFF messages.

Demo Code

/*/* ww w  .j  a  v  a2 s.  co  m*/
 * Copyright (c) 1999 - 2001 by Matthias Pfisterer
 * Copyright (c) 2003 by Florian Bomers
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 */
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MetaMessage;
import javax.sound.midi.MidiDevice;
import javax.sound.midi.MidiMessage;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Receiver;
import javax.sound.midi.ShortMessage;
import javax.sound.midi.SysexMessage;
import javax.sound.midi.Transmitter;
import org.apache.log4j.Logger;

public class Main{
    static Logger log = Logger.getLogger(MidiUtils.class.getName());
    public static final String NOTE_ON = "NOTE ON";
    public static final String NOTE_OFF = "NOTE OFF";
    public static final String POLYPHONIC_KEY_PRESSURE = "POLYPHONIC KEY PRESSURE";
    public static final String CONTROL_CHANGE = "CONTROL CHANGE";
    public static final String PROGRAM_CHANGE = "PROGRAM CHANGE";
    public static final String KEY_PRESSURE = "KEY PRESSURE";
    public static final String PITCH_WHEEL_CHANGE = "PITCH WHEEL CHANGE";
    public static final String SYSTEM_MESSAGE = "SYSTEM MESSAGE";
    public static final String UNKNOWN_MESSAGE = "UNKNOWN MESSAGE";
    /**
     * Normalizes the midi signature by removing the velocity from NOTE_ON and
     * NOTE_OFF messages. Normalizes CONTROL_CHANGE, KEY_PRESSURE,
     * POLYPHONIC_KEY_PRESSURE and PITCH_WHEEL_CHANGE messages to 0 or 127.
     * 
     * @param message
     *            The original midi message
     * @return the normalized midi message
     */
    public static MidiMessage normalizeMidiMesage(MidiMessage message) {

        MidiMessage result = message;
        if (message instanceof ShortMessage) {

            ShortMessage shortMessage = (ShortMessage) message;
            int command = shortMessage.getCommand();
            int channel = shortMessage.getChannel();
            int commandNo = shortMessage.getData1();
            int value = shortMessage.getData2();

            String strCommand = decodeCommand(shortMessage.getCommand());

            try {
                if (strCommand == NOTE_ON || strCommand == NOTE_OFF) {
                    value = 0;
                    result = new ShortMessage(command, channel, commandNo,
                            value);
                }

                if (strCommand == POLYPHONIC_KEY_PRESSURE
                        || strCommand == KEY_PRESSURE
                        || strCommand == PITCH_WHEEL_CHANGE) {

                    if (value <= 63) {
                        value = 0;
                    } else {
                        value = 127;
                    }
                    result = new ShortMessage(command, channel, commandNo,
                            value);
                }

            } catch (InvalidMidiDataException e) {
                log.error("The MIDI message to normalize is invalid", e);
            }
        }

        return result;
    }
    /**
     * Interprets the midi command byte code to a readable String.
     * 
     * @param command
     *            The midi command
     * @return a readable command
     */
    private static String decodeCommand(int command) {
        String result;
        switch (command) {
        case 0x80:
            result = NOTE_OFF;
            break;

        case 0x90:
            result = NOTE_ON;
            break;

        case 0xa0:
            result = POLYPHONIC_KEY_PRESSURE;
            break;

        case 0xb0:
            result = CONTROL_CHANGE;
            break;

        case 0xc0:
            result = PROGRAM_CHANGE;
            break;

        case 0xd0:
            result = KEY_PRESSURE;
            break;

        case 0xe0:
            result = PITCH_WHEEL_CHANGE;
            break;

        case 0xF0:
            result = SYSTEM_MESSAGE;

        default:
            result = UNKNOWN_MESSAGE;
            break;
        }
        return result;
    }
}

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